Sulcorebutia sp. &nbsp &nbsp 5/11/19 Many cacti will flower when quite small. I don't know where the idea that they're hard to flower came from. Maybe because most people keep them in a house where there is even less light than the light in the Pacific Northwest. The pot is 2.5" (6 cm) on a side. The CSSNM website has my article on how to get cacti to flower. (06/88)